[OSGeo-Discuss] Can someone test a program with point clouds?

[Rajat Shinde]

-- Resending it again with reduced size, please ignore if received twice. --

Thanks for the detailed instructions.
Initially, I tried with a huge point cloud scene but it was getting
difficult to visualize so then I sampled a small subset out of it. The
subset is having a valley sort of and hence it was expected to produce
steep triangles. All the experimental results are in the attached zip file.
The experiments were done for Release 0.3.3
<https://github.com/phma/perfecttin/releases/tag/0.3.3>, 0.3.6
<https://github.com/phma/perfecttin/releases/tag/0.3.6> and 0.4.0rc1
(master).

As mentioned, the spikes are visible in 0.3.3 but it gets pretty smooth and
smaller in 0.3.6 and 0.4.0rc1. Please check it. I have also added some
screenshots for visual comparison.

Not sure about the attachment size on the mailing list, so the results can
also be accessed here
<https://drive.google.com/drive/folders/1D9fAAooisQCO5BH_Ir12pyLe84Cqmy0z?usp=sharing>
.

I hope of not missing out on anything. Please let me know if I did.
I would love to see Dr Steer's reply; he is really point cloud heavy and I
have been following his articles lately. :)

Kind regards,
Rajat

On Sat, Apr 18, 2020 at 3:37 PM Rajat Shinde <rajatshinde2303 at gmail.com>
wrote:

> Thanks for the detailed instructions.
> Initially, I tried with a huge point cloud scene but it was getting
> difficult to visualize so then I sampled a small subset out of it. The
> subset is having a valley sort of and hence it was expected to produce
> steep triangles. All the experimental results are in the attached zip file.
> The experiments were done for Release 0.3.3
> <https://github.com/phma/perfecttin/releases/tag/0.3.3>, 0.3.6
> <https://github.com/phma/perfecttin/releases/tag/0.3.6> and 0.4.0rc1
> (master).
>
> As mentioned, the spikes are visible in 0.3.3 but it gets pretty smooth
> and smaller in 0.3.6 and 0.4.0rc1. Please check it. I have also added some
> screenshots for visual comparison.
>
> Not sure about the attachment size on the mailing list, so the results can
> also be accessed here
> <https://drive.google.com/drive/folders/1D9fAAooisQCO5BH_Ir12pyLe84Cqmy0z?usp=sharing>
> .
>
> I hope of not missing out on anything. Please let me know if I did.
> I would love to see Dr Steer's reply; he is really point cloud heavy and I
> have been following his articles lately. :)
>
> Kind regards,
> Rajat
>
> On Sat, Apr 18, 2020 at 1:57 AM Pierre Abbat <phma at bezitopo.org> wrote:
>
>> On Friday, April 17, 2020 2:57:13 PM EDT Rajat Shinde wrote:
>> > Hi Pierre,
>> >
>> > I would be very happy to do it. My PhD thesis involves LiDAR Point Cloud
>> > processing and these days I am fully covered up with LAS/LAZ files.
>> Though,
>> > I have not used PerfectTIN till now, but I can see the earlier releases
>> > available at https://github.com/OSGeo/perfecttin/releases.
>> >
>> > Please suggest me on how to proceed.
>>
>> Thanks! Here are the steps:
>>
>> Clone the repo (the latest commit should be on 2020-04-07 or later).
>>
>> Check out 0.3.3 and run it on some point clouds, looking for some where
>> the
>> TIN has big spikes (most likely in holes).
>>
>> Check out later commits and run them on the same clouds. The spikes
>> should
>> become smaller in horizontal area (they may be less than a millimeter
>> thick)
>> and then disappear. Thin spikes may appear in places they weren't before
>> (I've
>> seen them in falsely rough asphalt that is an artifact of photogrammetric
>> processing of pine needle shadows), but should disappear by the latest
>> commit.
>>
>> Also, would you like to contribute a translation?
>>
>> Pierre
>> --
>> gau do li'i co'e kei do
>>
>>
>>
>> _______________________________________________
>> Discuss mailing list
>> Discuss at lists.osgeo.org
>> https://lists.osgeo.org/mailman/listinfo/discuss
>
>
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